How to retain one million simultaneous TCP connections?

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Published on 2010-05-14T02:06:31Z Indexed on 2010/05/14 3:34 UTC
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I am to design a server that needs to serve millions of clients that are simultaneously connected with the server via TCP.

The data traffic between the server and the clients will be sparse, so bandwidth issues can be ignored.

One important requirement is that whenever the server needs to send data to any client it should use the existing TCP connection instead of opening a new connection toward the client (because the client may be behind a firewall).

Does anybody know how to do this, and what hardware/software is needed (at the least cost)?

Thanks in advance for any suggestions.

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